After listening to Chen Yu's explanation, Gu Chen had a detailed understanding of the four levels of the Vajra Realm.
The vast majority of Vajra Realm martial artists were at the first level, impervious to water and fire, with thirty percent of Vajra Realm martial artists at the second level, copper-clad and iron-cast.
Only about ten percent of Vajra Realm martial artists could reach the third level, their bodies as strong as fierce dragons.
As for the final level, Diamond Indestructible, even among the billions of martial artists in the Nine Provinces, it was rare to see one in several hundred years.
At the same time, Chen Yu also told Gu Chen that in martial arts cultivation, achieving a temporary lead did not mean much. Many people in the Tongmai Realm, who had only opened thirty or so meridian channels, still managed to progress far in martial arts. In the Vajra Realm, the Gang Qi Realm, and even higher realms, they achieved remarkable accomplishments.